Which statements must be true? select each correct answer.

cb=ba

cb∥xy

xy=2ca

ab∥xz

ca=1/2yz

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6

i believe that the answer is

b. y-1=-2(x-4)

hope this !